SwitchResX - SwitchResX is a tool designed to manage resolutions of all your monitors and HDTVs.
WebGazer.js - Eye tracking on the browser
EasyRes - EasyRes is a fast screen resolution switcher for Mac OS X with live animated previews.
FOVE - An eye tracking virtual reality headset (pre-launch)
Resolutionator - Resolutionator makes it simple to use any of your display's available resolutions.
Jabberwocky - Communicate through text to speech by moving your head